If you want a purpose-built battery that doesn't add much weight and brings a ton of function, we'd say the $99 MagSafe Battery Pack fits the bill.
Description:, 【Strong magnetic suction function】Only for Wireless/Magsafe Charging., 【The convenient way to charge】Just attach this compatible battery
Saistore 5000mAh Magnetic Power Bank MagSafe Battery Pack for iPhone 8/x/11/12/13/14 Pro White
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WWW Case Compatible with Apple MagSafe Battery Pack 2021,Protective Case Compatible with MagSafe Power Bank,Anti-Slip and Anti-fall Shockproof
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Magsafe Battery Pack
【Compatibility】Specially designed for MagSafe Battery Pack, perfect fit. (not include MagSafe Battery Pack) 【Premium Silicone Material】Made of
Protective Case for Apple Magsafe Battery Pack, Silicone Skin Cover Compatible with Magsafe Power Bank Holder, Lightweight Soft MagSafe Portable
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AirBox Go｜ The 3-in-1 MagSafe Battery Pack for Apple Devices by MOMAX Airbox — Kickstarter
